Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe64a6640f1b064…

MALICIOUS

PDF

113.0 KB Created: 2021-08-04 13:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9ee0190e48f58b586cfdd5cbeceaabf SHA-1: 1ddf3c1845f188337fdf5e6a0a55c41c2c4c72a4 SHA-256: 6fe64a6640f1b0641a501e40ad2935c10815a835f158f22cb0769fdf0218e894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/deveg.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7e5e58aa8611c1c3faeee388c784ce05/tarozesexu.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/16428204748.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/2494215483.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/7990646137.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/dukeb.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2fa49e18---10336080297.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/41287660166.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ec8ee64ec---37597200916.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/38141690519.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xotibamewewiju.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/79498655458.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026b0caf8ca---7804416565.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91b8da6c2---60080933243.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/75761400205.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4afdda4e4e---bekozomikipuzu.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/42865665714.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/1992633160.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/fosotip.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/nikoxexikebinu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e567d24a---nanag.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/71273262718.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2b8d6309---29666098504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=arap%C3%A7a+isim+c%C3%BCmlesi+ve+haber+%C3%A7e%C5%9FitleriPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017981.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17981 31412 bytes
SHA-256: 0ec676792af8bc3cb6f607f38393f01318d9add5ea172ac0dbf73140b156db6b
font_00_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 11232 bytes
SHA-256: 8c09486d0ea5b49e5a030ca30ec30d3388c5524e96801f400cc1246e53a627f5
font_01_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 21196 bytes
SHA-256: 3fa633dd993c0d98e309b0afe1864f717df2838c016e8197d5f794e83516f495
font_02_sfnt_off00016170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1